Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04Q—SELECTING
  • H04Q3/00—Selecting arrangements
  • H04Q3/0016—Arrangements providing connection between exchanges
  • H04Q3/0062—Provisions for network management
  • H04Q3/0095—Specification, development or application of network management software, e.g. software re-use
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
  • H04L9/40—Network security protocols
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
  • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
  • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
  • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
  • H04L69/329—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the application layer [OSI layer 7]
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation

Definitions

• the present invention concerns a method and a system of providing application service access on multiple heterogeneous networks. Although originating from mobile communications, the present invention can be applied to the whole telecommunication field. Furthermore, with convergence between telecommunication and computing, this invention can also be applied in data communication on packet-based networks such as IP (Internet Protocol) based networks.
• IP Internet Protocol
• 3GPP Third Generation Partnership Project
• UMTS Third Generation mobile system
• OSA Open Service Access
• UMTS Third Generation Mobile System
• OSA standards are defined in 3GPP, Virtual Home Environment; Open Service Architecture (Release 4). Valbonne, 2001. (3GPP TS 23.127, V4.1.0, 2001-04).
• the OSA allows the applications to access the network service capabilities such as Call Control (CC), User Status (US), Messaging (M), Location Information (LI), etc. through open interfaces.
• CC Call Control
• US User Status
• M Messaging
• LI Location Information
• Such architecture will certainly play a key role in the realisation of one or more "killer” applications, which is necessary for the success of UMTS. It is worth to stress that nobody knows yet what is going to be such a "killer” application. Indeed, for GSM nobody could predict that SMS (Short Message Service) has become the "killer” application.
• OSA is only intended for mobile networks. However, with convergence between telecom and computing, between fixed and mobile, it is crucial that an application is able to operate properly independently of the underlying network.
• OSA may be both wireline and wireless such as for example Wireless LAN (802.11), HiperLAN, or Bluetooth.
• OSA was only intended for mobile networks and it is not specified how to implement OSA for heterogeneous networks.
• OSA as specified by the 3GPP, is not sufficient to be applied to heterogeneous networks.
• the present invention proposes different embodiments to implement OSA on the top of several different networks. Also, additional functionality to OSA is required and proposed by this invention.
• the invention provides a telecommunication system providing application service access on multiple heterogeneous networks, comprising an open service access (OSA) extension with at least one framework providing interfaces between the applications and the multiple heterogeneous networks.
• OSA open service access
• a terminal ID administrator may be incorporated providing information to the applications in selecting the required network based on terminal ID.
• the system comprises one unique common framework for said networks and one service capability feature (SCF) for each network providing a network specific interface.
• the service capability features may include a general service property indicating which underlying network a SCF is interacting with.
• the general service property is expressed as a string containing a ⁇ operator, network> pair.
• a terminal ID administrator selects the required network service capability feature for an application based on terminal ID.
• the terminal ID administrator may include a database/directory containing mapping informa- tion between applications and the terminal IDs.
• the terminal ID administrator may also comprise a database/directory containing mapping information between applications and the service capability feature instances, between the service capability feature instances and the networks, and between the networks and terminal IDs.
• the terminal ID administrator is updatable in real time.
• An interface between the requesting application and the terminal ID administrator is provided by a terminal administrator (TA SCF) containing interface classes for application queries.
• TA SCF terminal administrator
• the terminal administrator includes program means for allowing an application to get a reference for the correct service capability feature instance for a given terminal, to query the service capability instance references for several terminal IDs simultaneously, to get a network ID of a given terminal, to get the references of all its service capability features instances, and to get the references of all its service capability features instances on a specific network.
• system may instead comprise one unique com- mon framework for the networks and a common service capability feature (SCF) for the networks providing a common network interface.
• SCF service capability feature
• a general service property may be included in the service capability features indicating which underlying network a SCF is interacting with. This general service property is expressed as a set of strings, where each string contains a ⁇ operator, network> pair.
• the interface may include service capability interface classes providing one to many mapping between applications and the interfaces of the underlying networks.
• the common service capability feature may include a mapping means for mapping interface classes to the network interfaces and a dispatcher means dispatching a request from an application to a correct network interface class.
• a registration interface between the mapping means and the dispatcher means may enable registration of the networks with the dispatcher.
• the dispatcher means includes selecting means selecting the correct service capability feature (SCF) for a request arriving from an application.
• SCF correct service capability feature
• a terminal ID administrator selects the required network service capability feature (SCF) for an application based on terminal ID.
• Mapping information between applications and the terminal IDs may be included in a terminal ID administrator database/directory.
• the database/directory includes mapping information between applications and the service capability feature instances, between the service capability feature instances and the networks, and between the networks and terminal IDs.
• the terminal ID administrator is updatable in real time.
• the terminal ID administrator (TA SCF) provides an interface for the SCF dispatcher means, and the terminal ID administrator comprises program means which when run provides getting a reference for the correct service capability instance for a given terminal in order to dispatch the request to that SCF instance, including getting the terminal ID that the application is handled, getting the application ID of the requesting application, and the references of the service capability feature instance returned by the SCF instance.
• the system may comprise a framework for each network, each framework having a service capability feature (SCF) for said network providing a network specific interface.
• SCF service capability feature
• Each framework may then include a mechanism enabling selection of a service capability feature in another framework and receipt of a reference to said service capability feature.
• the selectable service capability features for the frameworks may be predefined.
• Each framework may also comprise a terminal ID informator providing a service capability function to the applications regarding network selection based on terminal ID. The terminal ID informator returns a string containing a ⁇ Terminal ID, belong (True/False)> pair to the requesting application. All the frameworks may include program means executing when requested, a mutual authentication procedure. This may be the case each when other frameworks requesting information about the service capability features offered by said framework.
• the framework may comprise an extended interface.
• the extended interface may also include program means executing a request procedure returning an identity of the requesting framework together with a list of the predefined service capability features offered to said framework and a get procedure enabling a framework to request another network to return references of the service capability feature instances in accordance with the service properties specified by the requesting application.
• the terminal ID administrator selects the required network service capability feature for an application based on terminal ID. Selecting is enabled by a mapping function based on a database/directory interacting with the terminal ID administrator.
• the database/directory may also contain mapping information between applications and the service capability feature instances, between the service capability feature instances and the networks, and between the networks and terminal IDs.
• the heterogeneous networks includes but is not limited to telecommunication networks wireless or wireline, e.g. mobile, UMTS, GSM, PSTN/ISDN or computer networks like a packet based network, e.g. IP (wireline), Wireless LAN, Bluetooth or Hiper LAN (wireless).
• telecommunication networks wireless or wireline e.g. mobile, UMTS, GSM, PSTN/ISDN or computer networks like a packet based network, e.g. IP (wireline), Wireless LAN, Bluetooth or Hiper LAN (wireless).
• the present invention provides a method of providing application service access on multiple heterogeneous networks, comprising implementing an open service access (OSA) extension with at least one framework in an application programming interface (API) for the heterogeneous networks providing interfaces between the applications and the multiple heterogeneous net- works.
• OSA open service access
• API application programming interface
• the present invention provides a program of an application programming interface (API) for providing open service access for applications to multiple heterogeneous networks, the program comprising a set of instructions for carrying out the method and implementing the system above.
• the present invention provides a computer readable medium having stored thereon an application programming interface (API) for providing open service access for applications to multiple heterogeneous networks, the computer readable medium comprising a set of instructions for carrying out the method and implementing the system above.
• API application programming interface
• the service/applica- tion providers can develop applications more easily and also more interesting applications. They do not have to be concerned with different networks.
• the applications are more generic since they can run on heterogeneous networks. Quite a lot of re-use and saving can be achieved since the same application can be deployed at different networks.
• the user will enjoy a broader range of applications, which are enabled by the OSA API on heterogeneous networks.
• this invention addresses the OSA it could be applied for the PARLAY architecture since OSA relies quite a lot on PARLAY.
• the present invention solves a problem for service/application providers since it is simpler to develop applications for heterogeneous networks. At the same time it provides an opportunity to network operators who have heterogeneous networks (e.g. fixed and mobile, telecom and IP-based).
• the invention is defined in the appended claims.
• Figure 1 depicts on the left a present architecture where applications access a mobile network via the OSA, and on the right an extended OSA for heterogeneous networks according to an embodiment of the present invention
• Figure 2 shows an extended OSA for heterogeneous networks according to a first embodiment of the invention, using a common framework but where each network has its own SCFs
• Figure 3 shows relationships maintained by the TA in the first embodiment of the invention
• Figure 4 shows some of the properties of the Terminal ID Administrator in the first embodiment of the invention
• Figure 5 illustrates usage of Terminal Administrator SCF in the first embodiment of the invention
• Figure 6 is a view of an implementation of the present invention using a common framework and a common SCF incorporating all underlying networks
• Figure 7 shows usage of an SCF according to a further embodiment of the invention
• Figure 8 shows an example implementation of a second embodiment of the invention
• Figure 9 is a view of a dispatcher function in OSA according to a second embodiment of the invention
• Figure 10 illustrated the relationships maintained by the Terminal ID Administrator according to a second embodiment of the invention
• Figure 11 shows a third embodiment of the invention using one framework for each underlying network
• Figure 12 illustrates communication and collaboration between frameworks according to a fourth embodiment of the invention
• Figure 13 illustrates usage of US SCF in both the GSM network and the IP-Based network according to the embodiment shown in Figure 12, and Figure 14 shows communication between frameworks via OSA framework communication interfaces according to a fourth embodiment of the invention.
• This invention provides extended coverage of OSA (Open Service Access), which is originally intended to third generation mobile networks, to heterogeneous networks, i.e. comprising also PSTN, ISDN and IP-based network (Internet, Intranet).
• OSA Open Service Access
• heterogeneous networks i.e. comprising also PSTN, ISDN and IP-based network (Internet, Intranet).
• PSTN public switched telephone network
• ISDN ISDN-based network
• IP-based network Internet, Intranet
• Embodiment 1 A Common OSA framework for all networks and one Service Capability Feature for each network
• a single OSA framework is incorporating all networks, but each network has their own Service Capability Features (SCFs).
• SCFs Service Capability Features
• the GSM/UMTS network will have its SCFs such as Call Control (CC) SCF, User Interaction (Ul) SCF, User Status (US) SCF etc.
• CC Call Control
• Ul User Interaction
• US User Status
• each SCF is mapped into the interfaces specific for each network. How the mapping is done depends on the network. For example, the CC SCF responsible for the GSM network is mapped onto the interfaces issuing Call Control in the GSM network. The same applies to the CC SCF in the PSTN/ISDN network and the IP-Based network. This leaves us with a standardised CC API to Call Control network service capabilities for each of the networks in our heterogeneous network environment, allowing third party applications to use Call Control capabilities in all networks. The same applies to other SCFs.
• An SCF for each underlying network needs to be identified and registered with the OSA Framework.
• the values of the Service Properties of the SCF needs to indicate which network each SCF belongs to. It is also necessary to recognise the owner of the network, i.e. the network operator.
• a General Service Property called "Underlying Network' is introduced, which indicates which underlying network a SCF is interacting with.
• the property value is a string containing a pair: ⁇ Operator, network>.
• the value could be: ⁇ Telenor, GSM> or ⁇ Netcom, GSM> or ⁇ Telenor, IP-based (SIP)>.
• the terminal IDs could be a regular phone number, a name or an IP address.
• the application needs to subscribe to the right CC SCF if it wants to establish call for certain terminals.
• Some Terminal IDs are not in the scope of the GSM network e.g. SIP addresses, and call requests for these terminals should therefore not be addressed to the GSM network, but to the IP-based network.
• the User Status SCF allows applications to obtain the status (Reachable, Unreachable and Busy) of the user's terminals.
• the US SCF for the GSM network is only capable of delivering user status for terminals in the scope of GSM network (GSM phones registered in the HLR), the US SCF for the IP-based network is only capable of delivering user status for the users registered in the SIP server, etc.
• An application wanting to check the user status of a user has to select the right SCF instance, i.e. the right underlying network, according to the user's Terminal ID. For example, if the Terminal ID is a GSM number, the application has to select the US SCF instance for the GSM network. The application can then obtain the requested User Status by contacting the selected US SCF instance.
• the applications have problems to select the correct SCF instance when performing action on SCFs. They need to have information on terminal naming/numbering, i.e. which terminals belong to which networks. Furthermore, there should be a link between the terminal IDs and the correct SCF instance. Such information is not static but is subject to frequent 0 changes and needs to be updated frequently since people do change terminals, operators and subscriptions frequently. There is a need for an additional function, say Terminal ID Administrator, which assists the application in the selection of SCF based on terminal IDs.
• the Terminal ID Administrator incorporates a database/directory s service containing the mapping between applications and SCF instances, the mapping between SCF instances and networks and finally the mapping between networks and terminal IDs, as shown in Figure 3.
• the numbers in the figure indicate the cardinality. 1 mean one and exactly one while +1 means one or more.
• One application can have one or more SCF instance.
• One SCF instance has one o and only one application.
• One SCF has one and only one network while one network may have one or more SCF.
• One network has one or more terminals, but one terminal belongs to one and only one network.
• the TA allows network operators to register changes when they occur, and allows applications to query information about all the mappings mentioned above, e.g. the SCF instance for a set of 5 Terminal IDs as illustrated in Figure 4.
• the TA provides useful functionality for any applications that uses OSA.
• the TA should therefore be easily accessible for applications.
• an OSA Service Capability Feature SCF
• TA SCF Terminal Administrator SCF
• the TA SCF contains interface classes for application queries.
• the TA SCF interface for application queries contains the following methods which can be used by the applications: getSCFinstance ( ⁇ terminallD>, ⁇ applicationlD> ⁇ SCFreference>), ⁇ terminallD> is the terminal ID e.g. phone number that the application is handled application I D> is the ID of the requesting application
• ⁇ SCFreference> is the reference of the SCF instance returned by the TA SCF This method allows an application to get the reference of the correct SCF instance for a given terminal, e.g. e phone number.
• ⁇ applicationlD> is the ID of the requesting application
• ⁇ listof SCFreferences> is the list of references and corresponding Terminal IDs returned by the TA SCF
• This method allows an application to query the SCF instance references for several terminal IDs simultaneously.
• getAIISCFinstance ( ⁇ applicationlD> ⁇ ListofSCFreferencse>), ⁇ applicationlD> is the ID of the requesting application
• ⁇ SCFreference> is the list of the SCF instance references for an application returned by the TA SCF
• This method allows an application to get the references of all its SCF instances.
• getAIISCFinstance ( ⁇ applicationlD>, ⁇ networklD>, ⁇ ListofSCFreferencse>), ⁇ applicationlD> is the ID of the requesting application
• ⁇ networklD> is the ID of the network, e.g. ⁇ Telenor, GSM>, ⁇ OperatorX, ISDN>, ⁇ OperatorY, IP-based>, etc.
• ⁇ SCFreference> is the list of the SCF instance references for an application returned by the TA SCF
• This method allows an application to get the references of all its SCF instances on a specific network.
• Embodiment 2 A common Framework and a common SCF (Service Capability Feature) for all networks
• a single OSA framework is incorporating all networks and an SCF is representing all underlying networks.
• the Call Control SCF will incorporate call control capabilities for the GSM/UMTS network, the PSTN/ISDN network and the IP-based network. The same applies to the other SCFs as shown in Figure 6.
• each SCF communicates with all networks.
• the CC SCF is mapped into the interfaces issuing Call Control in the GSM network, the PSTN/ISDN network and the IP-Based network.
• the applications are able to perform call control on all networks using only a single CC SCF. The same applies for other SCFs.
• An SCF is now representing several underlying networks and it is necessary to specify every one of them. It is also necessary to recognise the owner of each network, i.e. the network operator of each network.
• a General Service Property called "Underlying Network', which indicates which underlying networks a SCF is interacting with.
• the property value is a set of strings where each string contains a pair: ⁇ Operator, network>.
• ⁇ Operator For example for a User Status SCF the value could be: ⁇ Telenor, GSM>, ⁇ Netcom, GSM>, ⁇ Telenor, IP-based (SIP)> ⁇ . This is illustrated in the example in Figure 7.
• the application selects (trades) the User Status SCF in the GSM network and the IP based network, using the desired Service Properties in the OSA Framework. This is indicated by 1 in Figure 7.
• the OSA Framework then agrees to the service trading, makes a new instance of a User Status SCF, which can interact both with the GSM/UMTS network and the IP-based network, and then returns a reference to the User Status instance, to the application, as shown by 1.1 'New' in Figure 7.
• Each SCF is in this embodiment now responsible for all underlying networks, thus the Interface Classes of a SCF need to be mapped to all the interfaces for every network (One to many mapping).
• the Call Control Interface Classes have to implement the mapping between the OSA Call Control API to the SS7 INAP for the PSTN/ISDN network, the mapping between the OSA Call Control API and the SIP protocol for the IP-Based network and the mapping between OSA Call Control API and to CAMEL for the GSM/UMTS network. This is shown in Figure 8.
• SCF is split into two separate components:
• the component responsible for dispatching request from applications is an additional function to OSA.
• the interface to the applications must of course be the same as specified for each SCF in the OSA specification.
• the network specific SCF provides the "SCF dispatcher” a reference to itself and the Service Properties that it supports.
• the "SCF dispatcher” holds the knowledge of the capabilities for the network specific SCF and is then able to register itself with the OSA framework, supplying the Service Properties that it supports, i.e. the sum of all the Service Properties provided by each network specific SCF instance.
• SCF Dispatcher For each application, an instance of the SCF Dispatcher will be created. Depending upon which underlying networks the application is allowed to use service capabilities on, respective instances of SCF for each network will be created. The SCF Dispatcher instance stores the references of all these SCF instances.
• the "SCF dispatcher” also incorporates functionality to select the right SCF instance when a request arrives from an application. To illustrate the necessity of such a function, let us suppose that an application requests the status of a user to the US SCF. The Application has a Service Level Agreement indication that allows it to use the US SCF for the GSM network, the PSTN/ISDN network and the IP-Based network (SIP). The US SCF (“US SCF dispatcher”) is able to interact with all three underlying networks.
• the "SCF dispatcher" should use the Terminal ID Administrator (TA) to inquire the SCF instance from the Terminal ID.
• the "SCF dispatcher” is then able to dispatch the request from the application to the correct SCF instance, using the result from the query to the Terminal- ID Administrator. Note, that all res- ponses and reports from the network SCFs go through the "SCF dispatcher" before being sent to the respective application. This is illustrated in Figure 9.
• Terminal ID Administrator incorporates a database/directory service containing the mapping between applications and SCF instances, the mapping between SCF instances and networks and finally the mapping between networks and terminal IDs.
• the relationships maintained by the Terminal ID Administrator are shown in Figure 10.
• the numbers in the figure indicate the cardinality. 1 means one and exactly one, while +1 means one or more.
• the Terminal ID Administrator enables network operators to register changes when they occur.
• the Terminal ID Administrator also offers an interface to the SCF dispatchers which contains the following method:
• ⁇ terminallD> is the terminal ID that the application is handled
• ⁇ applicationlD> is the ID of the requesting application
• ⁇ SCFreference> is the reference of the SCF instance returned by the SCF instance. This method allows the SCF dispatchers to get the reference of the correct SCF instance for a given terminal in order to dispatch the request to that SCF instance.
• the Terminal ID administrator in this second embodiment is not visible and available to the applications in the same way as in the first embodiment, but exists only inside the framework, e.g. for the SCF dispatcher.
• an application wants to obtain the user status for a terminal ID, e.g. phone number 12345678.
• the CC SCF Dispatcher sends a request (getSCF instance) to the Terminal ID Administrator via the Terminal ID to SCF instance mapping.
• the CC SCF Dispatcher receives the object reference to the User Status SCF that the requested terminal ID belongs to. Now, the Dispather can use the correct US SCF without being concerned with underlying networks.
• Embodiment 3 A Framework for each network
• one OSA framework incorporates only one underlying network.
• the OSA framework in the GSM network has only the responsibility for the service capabilities in the GSM network, thus it controls all the SCFs (CC SCF, US SCF shown in Figure 11) in the GSM network.
• SCFs CC SCF, US SCF shown in Figure 11
• Each SCF is mapped to the interfaces specific for each network.
• the CC SCF in the GSM network is mapped onto the interfaces issuing Call Control in the GSM network.
• each framework has an SCF "Terminal ID Informator".
• the Terminal ID Informator SCF has an interface allowing applications to ask whether a terminal belongs to an underlying network supported by the framework.
• the ask procedure can be expressed as follows:
• TerminallnfoReq ⁇ Terminal ID, belong (True/Fa lse)>
• the terminal ID together with a true or false is returned from the SCF interface through the OSA Framework to the asking application. If the terminal does not belong to the framework, the procedure returns a False and the application proceeds by asking other frameworks until it receives a True as answer. The application can then select and use the desired SCF.
• the true/false is represented by a Boolean.
• An application wants to obtain the user status for a terminal ID, e.g. phone number 12345678.
• the OSA Framework forwards the request to the Terminal ID Informator SCF. If the terminal ID exists in that framework, the Informator SCF interface returns a True to the OSA Framework. The application will then select and use the desired SCF. If a false is returned, the application will send the request to another OSA Framework.
• Embodiment 4 Communication and collaboration between the different OSA frameworks
• one OSA framework incorporates only a single underlying network, like in the third embodiment.
• communication and collaboration are enabled between frameworks. Interoperability between frameworks is established and applications may need to deal with only one OSA framework, in order to make use of service capabilities from many heterogeneous networks (See Figure 12).
• the applications can also use the SCFs belonging to other frameworks on other networks by simply issuing requests towards their "home” framework.
• the framework will then communicate with the actual framework to ask for the reference of the SCF instance. If no such instance was created for the application, the "foreign" framework will create one and return the reference to the "home” framework. The "home” will then return the reference to the requesting application.
• the application may have references of several SCF instances, which represents different networks such as GSM, PSTN or IP. The service properties of each SCF instance are therefore differentiated.
• the Terminal ID Administrator will, when given a terminal ID, return the reference of the SCF to be used.
• the OSA interface in this embodiment comprises mechanisms to enable a framework to select an SCF in another framework and to be able to receive a reference to the SCF instance.
• the OSA Framework in the GSM net- work selects (trades) the US SCF in the IP-based network, using a method in the OSA Framework Communication API in the OSA Framework in the IP-based network. Then the framework returns the reference to the SCF instance to the application using an ordinary trading function specified by the OSA standard.
• the OSA Framework in the GSM net- work selects (trades) the US SCF in the IP-based network, using a method in the OSA Framework Communication API in the OSA Framework in the IP-based
• the OSA Framework IP-based network agrees to the service trading, makes a new instance of a US SCF for the IP-based network and returns a reference to the SCF to the OSA framework in the GSM network, which then returns the reference to the SCF application.
• the OSA frameworks for the different underlying networks know about each other and collaborate in order to serve the applications. What SCFs that are offered between the different frameworks are predefined. In addition the following functions are included in the OSA frameworks:
• the authentication procedure may be anyone known in the art.
• Every framework is extended with an interface allowing other frameworks to request information about the SCFs offered by the framework.
• the interface therefore includes the following SCFrequest method:
• SCFrequest ( ⁇ requestingFrameworklD>, ⁇ ListOfSCFoffered>), where ⁇ requestingFrameworklD > is the identity of the requesting framework and ⁇ ListOfSCFoffered> is the list of the offered SCFs, which are offered to the requesting framework. This list may be different depending on the requesting framework.
• the requesting OSA framework saves the list with offered SCF's in the same way as "local" registered SCFs. In this way it is able to show it to the requesting applications. It also saves the information about which OSA framework owns what SCFs.
• Every framework is extended with an interface allowing other frameworks to use its SCFs.
• the interface includes the following methods:
• ⁇ servicelD> is the ID of the requesting SCF
• ⁇ serviceProperties> is the list of properties specified by the application belonging to the requesting framework
• ⁇ reference> is the reference of SCF instance
• ⁇ frameworklD> is the ID of the requesting framework
• ⁇ applicationlD> is the ID of the requesting application
• an OSA framework can request another framework to return the reference of the SCF instance according to the service properties asked by its application. If no such instance exists, the framework will create one.
• the OSA framework must save the received reference with its respective OSA framework.
• An OSA framework should have a list of SCF instance references and their respective framework. Communication between the OSA frameworks, using the interfaces specified above, is shown in Figure 14.
• each framework is equipped with a Terminal ID Administrator (TA), which is implemented as an SCF.
• TA Terminal ID Administrator
• the TA SCF is similar to the one described in embodiment 1.
• the TA SCF is supplied with the terminal ID ranges supported by each OSA framework. (A terminal ID may e.g. be a telephone number or an IP address or a name.) These can be supplied by several ways such as off-line installation, by enabling interaction between TAs or by having a common information database.
• An application wants to obtain the user status for a terminal ID, e.g. phone number 12345678.
• the OSA Framework forwards the request to the Terminal ID Administrator SCF. If the terminal ID exists in that framework, the application will then select and use the desired SCF. If the requested terminal ID is outside the ranges supported by the OSA, the OSA Framework will request another framework according to the framework list of SCF instance references and their respective framework.

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